Import Coupons from ICODES

Hi,
I joined ICODES and selected my merchant’s networks, joined about 100 merchants, then I imported all merchants to my coupon press theme site, I have noticed some unjoined stores vouchers are not working, so I want to delete the vouchers from one particular store, but this store has hundreds vouchers, how can I delete all these vouchers in one go? in admin panel, this store has 28 pages vouchers, I thought if I just delete the store, its voucher won’t be showing, but the result is vouchers are still showing on the page only without store image, is there an quick way to delete these vouchers?
Thank